He has a Malevolent weapon (just as I do!). Though the tooltip in the armory doesn't show it, it gives between 4100 and 5100 PvP power depending on upgrade level. My power (armory in sig), is nearly 51%
His human racial also allows him to equip a second DPS trinket with extra PvP power on it, thus boosting his PvP power further
If I can recall correctly, a normal amount of PvP power for a resi gemmed, none-human DK is around 45%~ so you shouldn't worry about it so much after you get T1 2/2 weapon, we have plenty of offensive power even with low PvP power values anyway.
I pad in heroic because I'm really fuckin skilled [insert sarcastic twitch chat emote here]